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Finding the Fourth Proportional to 20,561.89, 30,843.02 and 4,979.53

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Solution

The fourth proportional to 20,561.89, 30,843.02 and 4,979.53 is: 7,469.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.89 : 30,843.02 = 4,979.53 : x
  2. Step 2: Convert to fraction form
    20,561.89/30,843.02 = 4,979.53/x
  3. Step 3: Cross multiply
    20,561.89x = 30,843.02 × 4,979.53
  4. Step 4: Simplify right side
    20,561.89x = 153,583,718.48
  5. Step 5: Solve for x
    x = 153,583,718.48/20,561.89
  6. Step 6: Final answer
    x = 7,469.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.